Incredible deal that Erik posted earlier.
If you are based in Europe (or are there for a bit during June) consider this mileage run!
Go from Rome to Tokyo and then back to Frankfurt. The best best is that you can stop over in Colombo (Sri Lanka) and even grab a flight to the Maldives for just 7,500 Avios (or about $100 in fares).
Seeing as AAdvantage has a double miles promotion for Sri Lankan Airlines (since it just joined Oneworld) until July 1st you will receive an incredible 36,654 miles for $554.54 (or 1.5 CPM).
This deal makes it almost viable to extend a European vacation. Right now it seems only bookable on the Sri Lankan Airlines website.
Use Multi-City and plug in random dates (we checked for many dates). The stopover in Colombo can be for as long as you want (just make sure you do not miss the July 1st deadline).